Percentage

Question

Brady needs to cut a piece of paper 12 centimeters long.  He cuts pieces of the following lengths: 10.2 cm,  11.2 cm, 13.8 cm, and 18.0 cm.  Which cut results in a percent error of 15%? Select all that apply. 

Answer 1

(| x - 12|) / 12 = 0.15

|x - 12| = 1.8              multiply both sides by 12

 

I.

x - 12 = 1.8

x = 13.8

 

II

-(x - 12) = 1.8

x - 12 = -1.8

x = 10.2

 

The cut of 10.2 cm has the percent error of 15.